JP3410887B2 - Tape supply device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape feeding device capable of feeding a tape material with a substantially constant tension, and more particularly to a tape feeding device suitable for manufacturing a power cable or connecting it.

[0002]

2. Description of the Related Art The TMJ method is known as a method for connecting power cables. In this TMJ method, by the cross-linking treatment of the molding resin tape wound so as to cover the cable connection portion,
An insulator is formed. A tape supply device is used to wind such a tape. In this type of tape feeder, a tape pad consisting of a tape and a take-up shaft around which the tape is wound revolves around a cable connecting portion which is an object to be wound, and the tape is unwound according to this revolution. Rotate around the take-up shaft to allow it.

When the tape is unwound, the tape unwinding resistance is made variable according to the remaining amount of the tape, and a tape tension adjusting means for allowing the tape to be wound with a constant tension is incorporated in the tape feeding device. There is. Japanese Patent Application Laid-Open No. 5-301684 discloses a tape supply device incorporating the tape tension adjusting means proposed by the inventor of the present application. According to this adjusting mechanism, the brake drum is provided in relation to the tape pad, and the pressing force of the brake shoe pressed against the brake drum is adjusted to reduce the feeding rotational resistance according to the decrease in the remaining amount of the tape. The tape can be wound with a constant tension.

[0004]

By the way, the above-mentioned conventional tape tension adjusting means depends on mechanical frictional force, and when the state of the braking surface changes, the braking force changes.
Therefore, in order to feed out the tape with a constant tension, in order to maintain the state of the braking surface in a predetermined state, it is necessary to perform regular maintenance and inspection for checking the degree of wear of the brake shoe that is the braking portion. Therefore, an object of the present invention is to provide a tape supply device including a tape tension adjusting means that can eliminate the need for periodic maintenance and inspection of the braking portion.

[0005]

The present invention basically comprises
As tape tension adjusting means, magnetic force is used without using mechanical frictional force. <Structure> The present invention provides a magnetic hysteresis change that includes a housing that projects a rotatable shaft integrally with a tape pad, and an adjustment ring that is rotatably provided in the housing and that makes the rotational resistance of the shaft variable by a rotating operation. A rotating resistance variable adjuster used, in which either the adjusting ring or the housing is fixedly supported by the frame, and the tape wound by detecting the tape winding diameter of the tape pad It is characterized by including an interlocking mechanism for rotating the other of the housing or the adjustment ring of the rotation resistance variable adjuster in order to reduce the feeding rotation resistance value of the tape pad with the decrease of the winding diameter. In the tape supply device according to the present invention, the rotation resistance variable adjuster is fixedly supported on the frame by either the housing or the adjustment ring, and the other of the housing or the adjustment ring is rotationally operated by the interlocking mechanism. The rotation resistance variable adjuster changes the magnetic hysteresis inside the rotation operation by the interlocking mechanism, and thereby changes the rotation resistance of the shaft serving as the rotation axis of the tape pad. Since the interlocking mechanism adjusts the rotation resistance variable adjuster adjustment so as to reduce the rotation resistance of the rotation resistance variable adjuster according to the decrease in the tape winding diameter of the tape pad, the rotation resistance value of the tape pad is It is reduced as the tape winding diameter is reduced.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a perspective view schematically showing a specific example of the tape supply device according to the present invention. Also,
FIG. 2 is a vertical cross-sectional view of the tape supply device according to the present invention. As shown in FIGS. 1 and 2, the tape supply device 10 according to the present invention is rotatably mounted on a movable frame 11 that rotates around a connection portion of a power cable, which is a tape winding target. Tape pad 12,
The tape pad 12 is provided with a rotation resistance variable adjuster 13 for giving a predetermined rotation resistance. Tape pad 12
Is provided with a winding shaft 14 and, for example, a polyethylene tape 15 for TMJ wound around the winding shaft 14 with a winding diameter, that is, a radius r. Rotational resistance variable regulator 1
3 is a kind of well-known magnetic brake known as a so-called permanent magnet brake, which has a cylindrical housing 16, a shaft 17 protruding from the end of the housing 16, and a rotation resistance of the shaft 17. And an annular adjusting ring 18 for

The operating principle of the rotational resistance variable adjuster 13 will be described later, but the rotational resistance of the shaft 17 can be changed by changing the relative rotational positions of the housing 16 and the adjusting ring 18. Rotational resistance variable regulator 1
3 is, in the illustrated example, as clearly shown in FIG.
So that the shaft 17 projects from the movable frame 11,
The adjusting ring 18 is fixed to the movable frame 11 via a screw member 18A. The tape pad 12 is detachably attached to the tip of the shaft 17 that rotatably projects from the movable frame 11 so that the winding shaft 14 of the tape pad 12 rotates integrally.

An interlocking mechanism 19 is provided in association with the tape pad 12 and the rotary resistance variable adjuster 13. The interlocking mechanism 19 is rotatably supported by the movable frame 11, and is fixed to the shaft member 20 arranged parallel to the shaft 17 and one end of the shaft member 20 on the side of the tape pad 12 at the base end portion. And a swing arm 21. At the tip of the swing arm 21, a detection roller 22 that can come into contact with the winding diameter portion of the polyethylene tape 15, that is, the outermost peripheral surface of the polyethylene tape 15 portion wound on the winding shaft 14 of the tape pad 12, rotates. It is supported as much as possible.
Further, the movable frame 11 is provided with a hook portion 24 on which one end of the coil spring 23 is formed, and the other end of the coil spring 23 is locked to the tip portion of the swing arm 21. Due to the tension spring force of the coil spring 23, the swing arm 21 causes the detection roller 22 provided at the front end to face the winding diameter portion of the polyethylene tape 15 from the outside of the tape pad 12 with the shaft member 20 as the swing center. Pressing force is applied as if pressing it. Instead of the coil spring 23, an elastic member such as rubber can be appropriately adopted.

Therefore, when the winding diameter r of the polyethylene tape 15 is reduced by feeding the polyethylene tape 15 from the tape pad 12, the detection roller 22 in contact with the winding diameter portion is displaced in accordance with the reduction of the winding diameter r. The shaft member 20, which is the rocking shaft of the rocking arm 21, rotates according to the displacement of the detection roller 22. In order to transmit this rotation to the rotation resistance variable adjuster 13, the other end of the shaft member 20 has a gear. 25 is fixed, and the rotation resistance variable adjuster 13 is fixed.
In the housing 16 of the driven gear 2 that meshes with the gear 25.
6 is fixed.

The shaft member 20 is moved according to the displacement of the detection roller 22.
When the driven gear 26 rotates with the rotation of the gear 25 fixed to the shaft member 20, the driven gear 26
The rotation of the housing 16 causes the housing 16 to which the driven gear 26 is fixed to rotate relative to the adjustment ring 18 fixed to the movable frame 11. By this rotation operation, the rotation resistance variable adjuster 13 serving as the rotation axis of the tape pad 12
Shaft 17 changes its rotational resistance.

FIG. 3 is a schematic view showing the operating principle of the rotational resistance variable adjuster 13. The rotation resistance variable adjuster 13 includes a pair of annular magnet plates 27 as shown in FIG.
And 28 and a circular hysteresis plate 29 arranged between the magnet plates 27, 28. The shaft 17 is provided integrally with the magnetic hysteresis plate 29 at the center thereof. Both magnet plates 27, 28 are relatively arranged on the shaft 1.
It is arranged so as to be rotatable around 7, one 27 of which is fixed to the housing 16 and the other 28 is fixed to the adjusting ring 18.

Each of the magnet plates 27 and 28 is magnetized so that the quarter-circle regions are alternately N and S magnetic poles. The housing 16 and the adjusting ring 1 such that the two magnetic plates 27 and 28 have different magnetic poles facing each other.
At the rotational position with respect to 8, as shown in FIG. 3B, the magnetic flux circuit is configured so that the magnetic flux passes through the hysteresis plate 29 in the plate thickness direction. Therefore, the magnetic flux density of the hysteresis plate 29 is relatively low, and the torque resistance to the rotation of the shaft 17 fixed to the hysteresis plate 29 is also low. On the other hand, at the rotational position of the housing 16 and the adjusting ring 18 such that the two magnet plates 27 and 28 have the same magnetic poles facing each other, as shown in FIG. The magnetic flux circuit is configured so that the magnetic flux passes in parallel directions. Therefore, since the magnetic flux density of the hysteresis plate 29 is relatively high, the torque resistance against rotation of the shaft 17 fixed to the hysteresis plate 29 is also high. Therefore, the rotational resistance of the shaft 17 can be made variable by changing the relative rotational position between the housing 16 and the adjustment ring 18.

FIG. 4 is a graph showing a torque characteristic curve with respect to the rotation operation of the rotation resistance variable adjuster 13. The horizontal axis is the adjustment scale, that is, the housing 16 and the adjustment ring 18.
And the vertical axis indicates the torque resistance, that is, the torque resistance with respect to the rotation of the shaft 17. The straight line areas A to B of the characteristic curve 30 indicate that there is a proportional relationship between the rotational operation angle and the torque resistance value. This characteristic is not affected by the change in the rotation speed of the shaft 17.
An example of such a rotation resistance variable adjuster 13 is a Permahis torque controller manufactured by Ogura Clutch Co., Ltd.

The maximum torque resistance value indicated by the symbol B in the linear region of the Tokule characteristic curve 30 corresponds to the maximum winding diameter of the tape, and the minimum winding resistance value indicated by the symbol A is the minimum winding resistance value of the tape. Correspondingly, by appropriately selecting the gear 25 and the driven gear 26, relative rotation between the housing 16 and the adjustment ring 18 via the gear 25 and the driven gear 26 according to the reduction of the winding diameter r of the polyethylene tape 15. The position can be changed so that the rotational resistance of the shaft 17 can be appropriately reduced.

In the tape supply device 10 of the present invention, when the movable frame 11 rotates around the connection portion of the power cable, which is the tape winding object, the tape pad 12 supported by the movable frame 11 is also rotated by the power cable. Revolving around, the tape pad 12 at this time feeds out the polyethylene tape 15 while rotating integrally with the shaft 17 of the rotation resistance variable adjuster 13.

When the polyethylene tape 15 is fed out and the winding diameter r of the tape 15 is large, the pulling force T of the polyethylene tape 15 also increases the rotational moment acting on the tape pad 12, but opposes this large moment force. Then, the rotation resistance variable adjuster 1
3 provides the tape pad 12 with a relatively large rotational resistance (B).

Further, the moment force acting on the tape pad 12 is reduced as the winding diameter r of the tape 15 is reduced as the tape 15 is unwound, but the housing 16 is operated by the interlocking mechanism 19 as the winding diameter r is reduced. Is rotated, and the rotation resistance variable adjuster 13 is rotated by the rotation of the housing 16.
The rotational resistance of the shaft 17 is reduced toward a relatively small rotational resistance value (A).

From this, it is possible to apply a substantially constant back tension to the polyethylene tape 15 regardless of the increase or decrease of the winding diameter r. Moreover, since the rotation resistance variable adjuster 13 provides the rotation resistance by the magnetic action force, the rotation resistance force does not change due to the change of the state of the mechanical friction surface or the like as in the mechanical friction. In comparison, the polyethylene tape 15 can be more uniformly and evenly wound around the electrical connection. Therefore, by the cross-linking treatment of the wound polyethylene tape 15, it is possible to form an electric insulator having further excellent pressure resistance. Further, since the rotation resistance variable adjuster 13 does not have a mechanical friction surface for braking, the tape supply device 10 of the present invention does not require frequent inspection and maintenance work as in the conventional case, and the tape supply device 10 can perform a predetermined operation. Demonstrate the performance of.

As the interlocking mechanism 19, an example in which a gear assembly including the gear 25 and the driven gear 26 is provided is shown, but a connecting means such as a timing belt or a chain can be applied instead of this gear assembly. Further, although an example in which the detection roller 22 is used as the means for detecting the winding diameter r of the tape pad 12 is shown, an opto-electricity detecting means in which the winding diameter r is combined with, for example, a photodiode or the like can be applied.

In the above description, the present invention has been described with reference to a tape feeding device for polyethylene tape for TMJ of a power cable. However, the present invention is not limited to this, and the present invention is not limited to this. It can be applied to various tape supply devices other than manufacturing.

[0021]

In the tape supply device of the present invention described above, the rotary resistance variable adjuster that is subjected to the adjustment operation by the interlocking mechanism is not dependent on the mechanical frictional force but by its magnetic acting force. Rotational resistance is reduced according to the tape winding diameter. Therefore, according to the present invention, a mechanical friction portion for braking, such as a brake shoe, is not required, and thus periodic inspection for maintenance of the mechanical friction portion is not required. Furthermore, since braking does not depend on mechanical friction, changes in the braking force do not occur due to changes in the friction surface, and a stable braking force is always exerted by the magnetic action force. This tape can be unwound with a sufficient tension applied, which allows a uniform and uniform tape winding operation.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a tape supply device according to the present invention.

FIG. 2 is a vertical sectional view of a tape supply device according to the present invention.

FIG. 3 is a schematic diagram for explaining the principle of a rotation resistance variable resistor according to the present invention.

FIG. 4 is a graph showing an example of a torque characteristic curve of a rotation resistance variable resistor according to the present invention.

[Explanation of symbols]

10 Tape feeder 11 movable frame 12 tape pad 13 Rotational resistance variable regulator 15 Polyethylene tape 16 housing 17 shaft 18 Adjustment ring 19 Interlocking mechanism 20 (Shaft member) Swing shaft 21 Swing arm 25 gears 26 Driven gear

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02G 15/08 B65H 23/182 B65H 77/00 H01B 13/08

Claims (2)

(57) [Claims] 1. A magnetic hysteresis change is used, which comprises a housing that projects a rotatable shaft integrally with a tape pad, and an adjusting ring that is rotatably provided on the housing and that makes the rotational resistance of the shaft variable by a rotating operation. A rotary resistance variable adjuster in which either the adjustment ring or the housing is fixedly supported by a frame, and the tape winding diameter of the tape pad is detected, and the tape is fed out. A tape supply device comprising: an interlocking mechanism that rotates the other of the housing or the adjustment ring to reduce a feeding rotation resistance value of the tape pad as the tape winding diameter decreases. 2. The interlocking mechanism includes a swing arm that is pressed from the outside of the tape pad toward the winding diameter portion of the tape, and a swing arm that is fixed to a swing shaft of the swing arm. A gear that rotates in response to the swinging motion, and the housing or the other of the adjustment ring that rotates integrally with each other,
The tape supply device according to claim 1, further comprising a driven gear that meshes with the gear.